Ontology highlight
ABSTRACT:
PROVIDER: PRJNA544733 | ENA |
REPOSITORIES: ENA
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Project description:Pancreatic ductal adenocarcinoma (PDAC) is a highly aggressive disease with limited and very often, ineffective medical and surgical therapeutic options. The treatment of patients with advanced unresectable PDAC is restricted to systemic chemotherapy, a therapeutic intervention to which most eventually develop resistance. Recently, nab-paclitaxel has been added to the arsenal of first line therapies, and the combination of gemcitabine and nab-paclitaxel has modestly prolonged median overall survival. However, patients almost invariably succumb to the disease, and little is known about the mechanisms underlying nab-paclitaxel (n-PTX) resistance. Using the conditionally reprogrammed (CR) cell approach, we established and verified continuously growing cell cultures from treatment-naive PDAC patients. To study the mechanisms of primary drug resistance, nab-paclitaxel-resistant (n-PTX-R) cells were generated from primary cultures and drug resistance was verified in vivo, both in zebrafish and in athymic nude mouse xenograft models. Molecular analyses identified the sustained induction of c-MYC in the nab-paclitaxel-resistant cells. Depletion of c-Myc restored nab-paclitaxel sensitivity, as did treatment with either the MEK inhibitor, trametinib, or a small molecule activator of protein phosphatase 2a (SMAP). Implications: The strategies we have devised, including the patient-derived primary cells and the unique drug resistant isogenic cells, are rapid and easily applied in vitro and in vivo platforms to better understand the mechanisms of drug resistance and for defining effective therapeutic options on a patient by patient basis
2019-05-31 | GSE131762 | GEO
Project description:c-Myc drives nab-paclitaxel resistance in pancreatic cancer
| PRJNA544707 | ENA
Project description:Pancreatic adenocarcinoma is one of the most aggressive and lethal forms of cancer. Chemotherapy is the primary treatment for pancreatic cancer, but resistance to the drugs used remains a major challenge. A genome-wide CRISPR interference and knockout screen in the PANC-1 cell line with the drug nab-paclitaxel has identified a group of spindle assembly checkpoint (SAC) genes that enhance survival in nab-paclitaxel. Knockdown of these SAC genes (BUB1B, BUB3, and TTK) attenuates paclitaxel-induced cell death. Cells treated with the small molecule inhibitors BAY 1217389 or MPI 0479605, targeting the threonine tyrosine kinase (TTK), also enhance survival in paclitaxel. Overexpression of these SAC genes does not affect sensitivity to paclitaxel. These discoveries have helped to elucidate the mechanisms behind paclitaxel cytotoxicity. The outcomes of this investigation may pave the way for a deeper comprehension of the diverse responses of pancreatic cancer to therapies including paclitaxel. Additionally, they could facilitate the formulation of novel treatment approaches for pancreatic cancer.
2024-03-21 | GSE262149 | GEO
Project description:To investigate the impact of first-line treatment with gemcitabine/nab-paclitaxel/indoximod on the transcriptional profile of metastatic lesions in patients with pancreatic carcinoma, we collected tissue biopsies at pre- and post- (8wks) treatment and performed RNAseq.
2023-06-22 | GSE223463 | GEO
Project description:Aberrant tyrosine kinase activity can influence tumor growth and is regulated by phosphorylation. Pancreatic ductal adenocarcinoma (PDAC) is a very lethal disease, with minimal therapeutic options. We investigated phosphorylated kinases as target in PDAC. Mass spectrometry-based phosphoproteomic analysis was performed of PDAC cell lines to evaluate active kinases. Pathway analysis and inferred kinase activity was performed to identify novel targets. We investigated targeting of focal adhesion kinase in vitro with drug perturbations in combination with chemotherapeutics used against PDAC. Phosphoproteome analysis upon treatment was performed to evaluate signaling..PDAC cell lines portrayed high activity of multiple receptor tyrosine kinases. Non-receptor kinase, focal adhesion kinase (FAK), was identified in all cell lines by our phosphoproteomic screen and pathway analysis. Targeting of this kinase with defactinib validated reduced phosphorylation profiles. Additionally, FAK inhibition had anti-proliferative and anti-migratory effects. Combination with (nab-)paclitaxel had a synergistic effect on cell proliferation in vitro and reduced tumor growth in vivo. In conclusion, our study shows a high phosphorylation of several oncogenic receptor tyrosine kinases in PDAC cells and validated FAK inhibition as potential synergistic target with Nab-paclitaxel
2021-09-10 | PXD024548 | Pride
Project description:The goal of this study is to find a molecular signature that can predict response or resistance to Gemcitabine + Nab-paclitaxel therapy in pancreatic cancer (PC), to aid treatment selection for each patient. To this end, we analyzed blood-derived extracellular vesicles (EV).
2023-05-22 | GSE213341 | GEO
Project description:Chemoresistance hampers the treatment of patients suffering from pancreatic ductal adenocarcinoma (PDAC). The present study aimed to evaluate the proteome and phosphoproteome of gemcitabine-sensitive and -resistant PDAC cells to identify novel targets and predictive biomarkers.The oncogenic capabilities of sensitive and resistant PDAC cells were evaluated in vitro and in vivo. Cultured cells were subsequently analysed by label-free mass spectrometry. Differential proteins and phosphopeptides were evaluated for Gene Ontology and predictive and / or prognostic biomarker potential by immunohistochemistry of tissue microarrays (TMAs). Differential analyses showed that resistant proteins are associated with membrane organization and microtubule regulation. Importantly, resistant cells displayed an increased sensitivity for paclitaxel treatment in vitro (p < 0.001) and nab-paclitaxel had a strong anti-tumour efficacy in vivo. Microtubule-associated protein 2 (MAP2) was found to be highly upregulated and phosphorylated in resistant cells. The identified resistance marker MAP2 emerged as a novel prognostic marker in PDAC patients treated with gemcitabine.
2019-06-19 | PXD010112 | Pride
Project description:Blood was donated by a healthy volunteer with no known illness or malignancies. Mononuclear cells were separated from the blood by density gradient and CD14+ cells were isolated using anti-CD14 IgG-conjugated magnetic beads and magnetic separation (Miltenyi Biotec). Cells were cultured for 7 days prior to treatment for 96 hours with one of three TLR4 ligands: LPS, HMGB1 or Nab-Paclitaxel. Total RNA was extracted and was analyzed via SYBR Green RT-qPCR. We used an in-house array to analyze the gene expression of a total of 150 targets including 33 cytokines, 34 cytokine receptors, 11 known TLR targets, 64 other inflammation-related proteins, 31 endothelial related transcription factors, 12 myeloid associated genes, 12 genes expressed primarily in lymphatic endothelial cells, and 23 endothelial cell associated proteins. The results show a LPS, HMGB1 and Nab-Paclitaxel upregulated expression of lymphatic specific markers to varying degrees. LPS had the strongest induction of gene expression followed by HMGB1 and Nab-Paclitaxel, in general.
2016-04-22 | GSE78162 | GEO
Project description:Tumor-stroma interactions are critical in pancreatic ductal adenocarcinoma (PDAC) progression and therapeutics. Patient-derived xenograft (PDX) models faithfully recapitulate tumor-stroma interactions in PDAC, but conventional antibody-based immunoassay is largely inadequate to resolve or quantify tumor and stromal proteins. A species-deconvolved proteomics approach embedded in the ultra-high-resolution (UHR)-IonStar workflow can unambiguously quantify the proteins from tumor (human-derived) and stroma (mouse-derived) in PDX samples, enabling unbiased investigation of their proteomes with excellent quantitative reproducibility. With this strategy, 3 PDAC PDXs were analyzed. They were showed differential responses to treatment with Gemcitabine combined with nab-Paclitaxel (GEM+PTX), which is a first-line treatment regimen for PDAC. For each PDAC PDX, samples were collected after 24 hour and 192 hour with/without treatment, and each condition contained four biological replicates.
2023-07-05 | PXD042267 | Pride
Project description:tumor-stroma crosstalk drives pancreatic carcinogenesis we used time-resolved genome-wide transcriptional profiling to analyse changes caused by co-exposure of pancreatic tumor and stellate cells Primary pancreatic Stellate cells (PSC) were treated with a cumulative supernatant of pancreatic tumor cell lines (n=8) and harvested at 1-7, and 24 hours post exposure for RNA extraction and hybridization on Affymetrix microarrays. The 8 tumor cell lines are pancreatic ductal adenocarcinoma lines: AsPC1, BxPC3, Capan1, Colo357, MiaPaca2, Panc1, Su8686, and T3M4
2013-08-09 | E-GEOD-49583 | biostudies-arrayexpress